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# The adjacent diagram shows a heavy roller, with its axle at $O$, which is to be raised on a pavement $XY$. If there is friction between the roller and pavement, show by an arrow on the diagram the point of application and the direction of force to be applied.

Last updated date: 21st Jul 2024
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Hint: Friction is the force exerted by two surfaces moving (or attempting to slide) over one another. When you try to drive a book onto the board, for example, friction makes it impossible. Friction often acts in the opposite direction from where the target is going or attempting to travel.

$\tau \propto r$
Calculating the degree of the torque is as straightforward as determining the lever arm and multiplying it by the applied force. $r$ should be maximum to get maximum torque while holding force to a minimum. Force $F$ must be applied in the direction shown in the diagram.